package com.neu.util;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradePagePayRequest;
public class AlipayUtil {
    public static void startPay(HttpServletResponse resp,String out_trade_no,String total_amount,String subject,String body) {

        try {
            resp.setContentType("text/html; charset=utf-8");
            //调用支付宝
            //获得初始化的AlipayClient
            AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.gatewayUrl, AlipayConfig.app_id, AlipayConfig.merchant_private_key, "json", AlipayConfig.charset, AlipayConfig.alipay_public_key, AlipayConfig.sign_type);

            //设置请求参数
            AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
            alipayRequest.setReturnUrl(AlipayConfig.return_url);
            alipayRequest.setNotifyUrl(AlipayConfig.notify_url);

			/*
			//商户订单号，商户网站订单系统中唯一订单号，必填
			String out_trade_no = UUID.randomUUID().toString();
			//付款金额，必填
			String total_amount = new String(money+"");
			//订单名称，必填
			String subject = ;
			//商品描述，可空
			String body = ;
			*/
            /*设置参数*/
            alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","
                    + "\"total_amount\":\""+ total_amount +"\","
                    + "\"subject\":\""+ subject +"\","
                    + "\"body\":\""+ body +"\","
                    + "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");

            //若想给BizContent增加其他可选请求参数，以增加自定义超时时间参数timeout_express来举例说明
            //alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","
            //		+ "\"total_amount\":\""+ total_amount +"\","
            //		+ "\"subject\":\""+ subject +"\","
            //		+ "\"body\":\""+ body +"\","
            //		+ "\"timeout_express\":\"10m\","
            //		+ "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");
            //请求参数可查阅【电脑网站支付的API文档-alipay.trade.page.pay-请求参数】章节

            //发送请求
            String result = alipayClient.pageExecute(alipayRequest).getBody();
            //输出到浏览器
            PrintWriter out = resp.getWriter();
            out.println(result);
            out.flush();
            out.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    public static boolean checkSign(HttpServletRequest request) {
        try {
            //获取支付宝请求过来反馈信息
            Map<String,String> params = new HashMap<String,String>();
            Map<String,String[]> requestParams = request.getParameterMap();
            for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
                String name = (String) iter.next();
                String[] values = (String[]) requestParams.get(name);
                String valueStr = "";
                for (int i = 0; i < values.length; i++) {
                    valueStr = (i == values.length - 1) ? valueStr + values[i]
                            : valueStr + values[i] + ",";
                }
                //乱码解决，这段代码在出现乱码时使用
                //valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
                params.put(name, valueStr);
            }
            boolean signVerified = AlipaySignature.rsaCheckV1(params, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type); //验证SDK码
            return signVerified;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
